ANNOTATED LIST OF THE SPECIES 175 
Kigenmann and Eigenmann, 1890, Oec. Papers Cal. Acad. Sci., I, 473; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 403; 
Regan, 1912, Ann. Mag. Nat. Hist., (8), X, 215. 
Basin of Rio Maranon 
151. CoryporAs AcuTus Cope 
Corydoras acutus Cope, 1871 (1872), Proc. Acad. Nat. Sei. Phila., XXIV, 281, Rio Ambyiacu; 
Eigenmann and Eigenmann, 1890, Oce. Papers Cal. Acad. Sci., 1, 474; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 403; 
Ellis, 1913, Ann. Carnegie Mus., VIII, 407; 
Gosline, 1940, Stanford Iehth. Bull., II, 1, 16. 
Rio Ambyiacu 
152. CORYDORAS AMPHIBELUS Cope 
Corydoras amphibelus Cope, 1871 (1872), Proc. Acad. Nat. Sei. Phila., XXIV, 282, Rio Ambyiacu; 
Eigenmann and Higenmann, 1890, Occ. Papers Cal. Acad. Sei., I, 474; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 403; 
Ellis, 1918, Ann. Carnegie Mus., VIII, 408. 
Corydoras armatus Gosline, 1940, Stanford Ichth. Bull., II, 1, 19. 
Rio Ambyiacu 
153. CoRYDORAS PALEATUS (Jenyns) 
Callichthys punctatus Cuvier and Valenciennes, 1840, Hist. Nat. Poiss., XV, 318; 
Valenciennes, 1847, Voy. Amer. Merid., LX, Atlas ii, pl. v, fig. 1. 
Callichthys paleatus Jenyns, 1842, Voy. Beagle, IV, 113; 
Ginther, 1864, Cat. Fish. Brit. Mus., V, 230. 
Corydoras paleatus Cope, 1871, Proc. Acad. Nat. Sci. Phila., X XIII, 280; 
Eigenmann and Higenmann, 1890, Oce. Papers Cal. Acad. Sci., I, 471; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 403; 
Stoye, 1934, Aquarium, 12-14, source unknown. 
Rio de la Plata basin and Rio Ambyiacu 
The aquarium habits and spawning are described by Mr. Stoye, and_ his 
article is illustrated by an excellent photograph from life. 
154. Coryporas zyGcatus Eigenmann and Allen, sp. nov. 
Plate XII, fig. 1 
15704, 8, 55-77 mm., the largest the type, creek, Yurimaguas, Allen, November, 1920. 
Alhed to C. macrosteus and C. eques, with lateral plates more numerous and 
with less vertical profile. 
Humeral plates in contact, at least in front. Preorbital not equal to its 
distance from the lips. 
Head 3.25; depth 2.66; D. I, 7 or I, 8; A. 6; plates 24 above, 21 below; one 
